DERIVATIVE AND HEDGING ACTIVITIES - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) instrument	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Derivative [Line Items]
Notional amount				$ 560,000,000.0	$ 560,000,000.0
Net unrealized gain (loss) on derivatives	$ (1,650,000)	$ (139,000)	$ 0
Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	460,000,000.0
Derivatives that qualified for hedge accounting treatment | instrument			0
Collar
Derivative [Line Items]
Net unrealized gain (loss) on derivatives	(2,300,000)
Tax benefit	(600,000)
Gain (loss) expected to be reclassified	1,100,000
Collar | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	460,000,000.0
Collar | Liabilities
Derivative [Line Items]
Derivative liability	(2,400,000)
Total Return Swap (TRS) | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	25,600,000
Net change in fair value of derivative instruments	6,600,000
Total Return Swap (TRS) | Not Designated as Hedging Instrument | Corporate general and administrative expenses
Derivative [Line Items]
Net change in fair value of derivative instruments	2,600,000
Total Return Swap (TRS) | Not Designated as Hedging Instrument | Operating Expense [Member]
Derivative [Line Items]
Net change in fair value of derivative instruments	$ 4,000,000.0